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1·An elliptic paraboloid is proposed as the failure surface for concrete under multiaxial Stresses.

本文用椭圆抛物面作为混凝土三向应力时的强度破坏面。

2·Identifying the basic properties of mining fissure elliptic paraboloid zone and gas delivery law governing goaf represents an effective measure to control gas.

研究采动裂隙椭抛带的基本性质及其采空区瓦斯运移的规律，可以采取有效措施进行瓦斯治理。

3·After raining, a dynamic Elliptic Paraboloid Zone distribution would be formed if the bed-separated fissures and broken fissures of the overlying stratum were connected.

综放开采后，上覆岩层中的离层裂隙和破断裂隙相互贯通后会形成一个动态变化的椭抛带分布。

4·A simple formula for calculating pure shear strength of concrete is derived on the basis of the verified mathematical model of concrete failure surface, the elliptic paraboloid.

本文根据已论证过的混凝土破坏面，即椭圆抛物面的数学模型，报导出一个用以计算混凝土纯剪强度的简单公式。